Liquid-crystalline behaviour of di- and mono-palladium organyls: two ways of lyomesophase formation
Abstract
Three members of a series of lath-like dinuclear complexes
[Pd
2
(µ-Cl)
2
(C,N)
2
]
1, (C,N=orthopalladated imine R
1
–C
6
H
3
–CH![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
N–C
6
H
4
–R
2
;
R
1
=alkoxy chain; R
2
=alkyl or alkoxy chain), a
dinuclear cyclopalladated complex with mixed bridges (acetate/thiolate)
2 and a mononuclear orthopalladated complex incorporating a
β-diketonate ligand 3, have been synthesized and
their lyotropic phase behaviour in mixtures with apolar organic solvents
(linear alkanes, cycloocta-1,5-diene or limonene) has been studied. The
lyotropic mesomorphism is determined by the combination of the length of
the metalloorganyl side chains and the length of alkane used as solvent.
Two ways of formation of lyotropic phases are found. The first case of
lyotropic chiral nematic (cholesteric, N*) phase formation in a binary
system composed of a non-chiral di- or mono-palladium organyl and a chiral
apolar organic solvent is reported.
N–C
6
H
4
–R
2
;
R
1
=alkoxy chain; R
2
=alkyl or alkoxy chain), a
dinuclear cyclopalladated complex with mixed bridges (acetate/thiolate)
2 and a mononuclear orthopalladated complex incorporating a
β-diketonate ligand 3, have been synthesized and
their lyotropic phase behaviour in mixtures with apolar organic solvents
(linear alkanes, cycloocta-1,5-diene or limonene) has been studied. The
lyotropic mesomorphism is determined by the combination of the length of
the metalloorganyl side chains and the length of alkane used as solvent.
Two ways of formation of lyotropic phases are found. The first case of
lyotropic chiral nematic (cholesteric, N*) phase formation in a binary
system composed of a non-chiral di- or mono-palladium organyl and a chiral
apolar organic solvent is reported.
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